Within the approximations of spherical lattice cell, central-field, and relativistic Fermi statis-tics, an algorithm with average atom model is presented to calculate the electronic energy levelsand equation of state for hot and dense matter at arbitrary densities and temperatures. ChoosingZink’s analytical potential as initial potential, we have solved the Dirac-Slater equation which satisfiesthe Weigner-Seitz boundary condition. The electronic energy bands are not taken into account. Tak-ing energy level degeneracy as a continuous function of density, we have considered the pressureionization effects for highly dense matter. Results for 13Al atom are shown.
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